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This product is a pH-balancing additive used to increase the pH of nutrient mixes to the optimal range
and dust mites
These products aren't just "containers" but rather root production tools
Probe Condition
20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 4 Pack dis This product is a pH-balancingImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. We also carry 4 7 8 and 5 1 4 inch depth filters,
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